AvX: Versus will be a 12-part miniseries written and illustrated by a rotating team.

Each of the issues will focus on two individual battles between members of the Avengers and X-Men.

"In a nutshell, as we've said in the past, in Avengers vs. X-Men, we're only doing tie-ins in our core Avengers and X-Men titles," said executive editor Tom Brevoort during Marvel's Next Big Thing conference call.

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"AvX: Versus is the least essential read of AvX, but it will probably be the most bestselling. It is literally the fight book."

"It is the ultimate book for the quintessential Marvel fan. There's going to be plenty of fighting in the main AvX title, but given the casts are so large and given that there are so many potential conflicts - if you go to any message board right now where people are talking about AvX and they want to see every character who's ever appeared in the Avengers fight every character that's ever appeared in the X-Men, there's not going to be enough space to do justice to all those conflicts in the main book."

Marvel announced the upcoming bi-weekly, 12-issue event miniseries in December, in which the X-Men and Avengers fight over the fate of the Earth as the legendary Phoenix force sets its sights on our planet.